# CVE-2026-10858

Authenticated heap underflow in IBM MQ for HPE NonStop allows DoS or RCE

- Page: https://www.vulneraibility.com/cve/CVE-2026-10858
- CVSS: 9.9
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 0.59% (percentile 48.3)
- CISA SSVC: exploitation none, automatable no, technical impact total (assessed 2026-09-18)
- Weakness: CWE-122
- Published: 2026-09-18

## Affected versions

- IBM MQ for HPE NonStop: affected >= 8.1.0 and <= 8.1.0.40

A version outside these ranges is not a statement that it is unaffected.

## Impact

Authenticated attacker sending multi-segment messages can trigger a heap buffer underflow to cause denial of service or execute arbitrary code on the MQ server.

## Action

Immediate action required

## Recommendation

Apply vendor update ASAP; restrict MQ access and monitor message traffic.

## References

- [patch] https://www.ibm.com/support/pages/node/7287704

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.